2). Dictionaries

• 2003 Ireri Mbaabu and Kipande Nzunga Sheng English Dictionary – Institute of Kiswahili Research, University of Dar es Salaam. (Contributed and acknowledged in all three (3)leading Kiswahili Dictionaries).
• 2017 Kamusi Kuu ya Kiswahili (BAKITA) National Kiswahili Council of Tanzania – Longhorn (p. viii)
• Kamusi ya Karne ya 21. Longhorn Publishers. Nairobi (Lexical Contribution (Vide Pg. V)
• Kamusi ya Kiswahili Sanifu .TUKI – Institute of Kiswahili Research, University of Daresalaam OUP – (Pg.viii)

3). Books

• 2017:  Masomoni California, Longhorn Publishers: Nairobi.
• 2007 Historia ya Usanifishaji wa Kiswahili (A History of Kiswahili Standardization) – Institute of Kiswahili Research, University of Dar es Salaam.
• 1996 (a) Language Policy in East Africa – A dependency Theory Perspective, Educational Research and Publication Limited, Nairobi, Kenya.
• 1996 (b) Mother Tongue in Education, Lectern Publications Ltd., Friends of the Book, Nairobi, Kenya.
• 1995 Usahihishaji wa Makosa Katika Kiswahili (Common Mistakes in Kiswahili) Longhorn Kenya Ltd.
• 1993 Sarufi ya Kiswahili (Swahili Grammar) Longman Kenya Limited (a revised edition). Reprinted (First published by KPBM in 1985).
• 1992 The Impact of Language Policy on the Development of Kiswahili in Kenya, 1930-1990, U.M.I. Dissertation Service, Ann Arbor, Michigan, (PhD Dissertation).
• 1991 Historia ya Usanifishaji wa Kiswahili (A History of Kiswahili Standardization). Longman Kenya Limited, Nairobi, Kenya.
• 1987 Lugha ya Kiswahili kwa Shule za Upili, Kidato cha Pili. (A Secondary Form II Text Co-authored with Sheila Ali Ryanga). Nairobi: Kenya Publishing and Book Marketing Company, Nairobi, Kenya.
• 1986 Lugha ya Kiswahili kwa Shule za Upili, Kidato cha Kwanza. (A Secondary Form I Text Co-authored with Sheila Ali Ryanga). Nairobi: Kenya Publishing and Book Marketing Company. Reprinted 1987, Nairobi, Kenya.
• 1985 (a) Utamaduni wa Waswahili. (Culture of the Swahili People). Nairobi: Kenya publishing and Book Marketing, Nairobi, Kenya.
• 1985 (b) New Horizons in Kiswahili, A Synthesis in Development Research and Literature. Nairobi: Kenya Literature Bureau.
• 1978 (a) Kiswahili Lugha ya Taifa. (‘Kiswahili the National Language’- Covering Usage). Nairobi: Kenya Literature Bureau. Reprinted in 1985.
• 1978 (b) Methali, Vitendawili na Mashairi ya Kimeru. (Kimeru Oral Literature – in Kimeru and Kiswahili). Nairobi: Kenya Literature Bureau.

Affiliations

• Member, International Editorial Advisory Board, Kiswahili journal – Institute of Kiswahili Research, University of Dar es Salaam. (For 10 years)
• Regular Internal Assessor for senior staff seeking promotion, Institute of Kiswahili Research, University of Dar es Salaam.
• External Examiner, Kiswahili in various Universities in the Region.
• Member, American National Geographic Society.